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nikitopo · 08-29-2018, 03:23 AM

An increase in diameter plays an important role. Check the difference in torque of the OEM exhaust manifold before and after the revision:

Blue color: before the revision
Red color: after the revision

The difference in power is 7 PS (JDM cars had before the revision 200 PS and after the revision 207 PS). I never understood why the NA cars got 5 PS.

The increase in torque has been measured also just by switching the exhaust manifold and get a tune. You don't need the red intake manifold or the other (internal) engine revisions.

08-29-2018, 03:23 AM	#3
nikitopo Senior Member Join Date: Mar 2014 Drives: '15 BRZ RA Location: Greece Posts: 3,787 Thanks: 2,417 Thanked 1,947 Times in 1,263 Posts Mentioned: 29 Post(s) Tagged: 0 Thread(s)	An increase in diameter plays an important role. Check the difference in torque of the OEM exhaust manifold before and after the revision: Blue color: before the revision Red color: after the revision The difference in power is 7 PS (JDM cars had before the revision 200 PS and after the revision 207 PS). I never understood why the NA cars got 5 PS. The increase in torque has been measured also just by switching the exhaust manifold and get a tune. You don't need the red intake manifold or the other (internal) engine revisions.